18 40 040 Removing and installing or replacing the exhaust manifold (N12, N16)

WARNING: This page is about a different variant/trim than selected.

WARNING: Risk of burning!
This repair work may only be carried out on an exhaust system which has cooled down.

Necessary preliminary work:

MOVE FRONT PANEL INTO WORKING POSITION.

NOTE: The oxygen sensors are in danger of being damaged when the exhaust manifolds are removed and installed.
REMOVE THE CONTROL SENSOR .
REMOVE MONITORING SENSOR .

Release screws.

Tightening torque 18 40 4AZ .

Remove upper heat shield (1).

Fig 1: Locating Upper Heat Shield Screws

G06916202

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws.

Tightening torque 18 40 4AZ .

Remove lower heat shield (1).

Fig 2: Identifying Lower Heat Shield Screws

G05528587

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws.

Tightening torque 18 40 3AZ .

Fig 3: Locating Screws

G06916204

Courtesy of BMW OF NORTH AMERICA, INC.

Unfasten clamp.

Tightening torque 18 31 5AZ .

Fig 4: Locating Clamp

G04796531

Courtesy of BMW OF NORTH AMERICA, INC.

Release nuts and remove exhaust manifold (1).

Installation note:

Replace gasket and nuts.
Clean sealing surfaces.
Apply a thin coating of copper paste to bolt thread.
Tightening torque 18 40 1AZ .

Fig 5: Locating Exhaust Manifold Nuts

G06916206

Courtesy of BMW OF NORTH AMERICA, INC.

Reassemble the vehicle.